The joy of stacking WMs is you can navigate through maximized windows you only have to maximize them once to do this. In a tiling WM windows must be selected and maximized each time which is annoying. Coincidentally, this is exactly how a person likely navigates windows with a tiling WM which orders the windows according to a schema without overlap at the cost of screen real-estate. They technically don't require a taskbar if they have key bindings (keyboard shortcuts) to navigate the windows. So, you should be able to see your windows in the taskbar via its title and simply select it with your mouse to bring it to front and into focus. On windows this taskbar holds the start button, quick launch, windows (in order that they are launched) and system tray. Microsoft Windows uses a stacking WM, but wait a minute why are the windows allowed to be stacked and where is the order? Two reasons: windows are allowed to be stacked to make the most out of screen real-estate and order is arbitrary and unnecessary for stacking WM if you can see it and select it then that is sufficient according to Microsoft and stacking WMs. The question is what does the WM do if it's a new window? Does it put on top of another window, beside it or allow for both possibilities? This is the basic difference between a stacking window manager, a tiling window manager and a dynamic window manager. When receiving these drawing orders part of those orders must specify whether to draw in an existing window or a new window. Drawing a taskbar, an application launcher, a dock, a system tray that's a number of programs giving more orders to WM. Restoring desktop content that's another program giving orders to WM. Drawing a background on the desktop (root window) that's a program that sends orders to the WM (Window Manager). Anything drawn on the screen that's a window manager at work, but it needs to receive drawing orders from a program or a number of programs. A window manager (WM) allows multiple windows to be drawn and is thus essential for multitasking and a huge evolution in OS design. Ubuntu and Debian are like DOS it receives input from the keyboard and responds to input by outputting text to one screen (one window).
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